Packing-ring.



A. .1. MUMWIERT.

PACKING RING.

APPLICATION FILED- MAR, I8. 1915.

Patented Dec. 5, 1916.

A'I'TOR/VE Y INVLIN'TOKv Arden J-Nummerf- ARDEN J". MUMMEBT, OF ST. LOUIS, MISSOURI.

PACKING-RING.

Specification of Letters Patent.

Patented Dec. 5, 11916.

Application filed March 18, 1915. Serial No. 15,321.

a citizen of the United States, residing at St. Louis, State of Missouri, have invented certaln new and useful Improvements 1n Packing-Rings, of which the following is a-ful1, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in piston-head packing rings; and it consists in the novel features of construction more fully set forth'in the specification and pointed out in the claims. v

The present improvement is directed to packing rings of the resilient split band type which are deposited in annular grooves formed about the peripheries of pistons and piston valves in gas, steam and other motorfluid driven types of engines, the special object of the present invention being to provide a packing ring of the character referred to which shall resist any tendency to leakage on the part of the motor fluid-during .the driving stroke of the piston, and

any tendency to leakage on the part of the oil film on the cylinder walls, past the piston and into the explosion chamber in gas engines, where the ring is employed on this type of engine.

The advantages of the invention will be better apparent from a detailed description thereof in connection with. the accompanying drawing in whichv Figure 1 is a longitudinal section through the cylinder of a gasengine with a piston in side elevation showing the application of my invention thereto; Fig. 2 is a plan view of the packing ring assembled; Fig. 3 is an edge view thereof; and Fig. 4 is an enlarged cross-section on the line 14; of Fig. 2.

Referring to the drawings, C represents the engine-cylinder, and P the piston, in the present example shown as equipped with a series of three of my improved rings. In the present embodiment of my invention, the ring comprises an outer resilient expanding or dilatable split band 1 provided with inwardly directed flanges a, a, along its opposite edges, whereby the band assumes the form of an annular channel, the open cavity of which-receives an inner resilient contractile split-gband 2 whose edges are carefully machined and loosely but snugly engage the inner machined surfaces of the flanges a, a, of the outer band. As well understood in this art, the ring is deposited in an annular groove 71. of the piston P. In the present instance-the inner band 2 being contractile will hug the bottom of the groove; and the outer band 1 being expanding or dilatable, will hug the inner walls of the cylinder, the result being that more or less of an annular clearance d will be left between the outer cylindrical face of the inner band 2, and the opposed or inner cylindrical face of the web portion of the outer channel band 1. The tendency of the inner band 2 to contract, and the outer band 1 to expand has the following advantages: During the reciprocations of the piston P the tight fit The tight joint formed by the contracting band 2 with the base of the groove 72. on the other hand prevents the escape of any oil which may find its way into the groove on the side facing the crank case, past the said band, and thus escape of oil into the explosion chamber is impossible. This joint of course likewise prevents the escape of the motor fluid. past the piston during the driving stroke of the latter, the driving stroke being the stroke the piston makes under the driving action of the fluid or gases.

ll do not wish of course to limit myself to the precise details hereshown as they may in a measure be departed from without affecting the nature or spirit of my invention.

Neither do I wish to be restricted to any specific number of bands which compose the packing ring. As shown in the drawings and pointed out in the description, the members 1, 2, normally tend to draw away from each other along a plane transverse or at right angles to the axis of the ring, that Some clearance of course would always be contractmg split member, and an outer expanding split member, one of the members being grooved or channeled to receive the other member;

.3. A packing ring comprising an outer resilient expanding split band, and an inner resilient contracting split band, one of the bands being provided with flanges overlapping the other band.

4. A packing ring comprising an outer resilient expanding split channel band, and an inner resilient contracting split band embraced by said outer band and lying within the channel thereof.

5. A packing ring comprising an outer resilient expanding split band provided with inwardly directed'flanges along its opposite edges, and an inner resilient contracting. split band confined between the flanges of the outer band.

6. A packing ring comprising an outer 8. In a packing ring, a pair of annular resilient members disposed in concentric relation to one another and operating to draw radially away from each other, one member lying within a groove of the opposite mem- 9. In a packing ring, a pair of annular resilient bands mounted one within the other, and operating to draw away from each other, in a plane transverse to the axis of the ring, the outer band being provided with a groove or channel in which the inner band permanently lies. In testimony whereof I afiix my signature, in presence of two witnesses.

. ARDEN J. MUMMERT.

Witnesses:

EMIL STAREK, ELSE M. Smom... 

